<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_focused="false" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/btn_press" />  
     <item android:state_focused="true" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/btn_press" />  
     <item android:state_focused="true" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/btn_press" />   
     <item android:state_pressed="true" android:drawable="@drawable/btn_press" />
     <item android:drawable="@drawable/btn_nor" />
</selector> 